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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b4d8fee6bdadbeed9da2fcb98dac17cd7e8bc4f912129f7c5803e1b9c081a6' 
  AND token = '6iWlwECyS7XoPyPZ872t69sKxP1p4MVIHRdBuUXTi0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}